Filter.



A. l. MOISANT.

FILTER.

APmcATlou FILED om. 21, 1916.

1 ,270,042. Patented June X8, 1918.

2 SHEETS-SHEET 2.

UNITED sTATEs PATENT OFFICE.

ALFRED J. MOISANT, 0F NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, T0 GENERAL RESEARCH LABORATORIES, A CORPORATION OF NEW YORK.

FILTER.

r eication of Letters Patent.

Patented June 1s, 191s.

Application filed October 27, 1916. Serial No. 127,985.

To all twhom 'it may concern.'

Be it known that I, ALFRED J. MorsaN'r, a citizen of the United States, residing at the city of New York, in the borough of Manhattan and State of New York, have invented certain new and useful Improvements in Filters, of which the following is a full, clear, and exact description.

My invention relates to filters and an object of my invention is to provide a construction which will be thoroughly effective Y and reliable in its opetn. Another object is to provide a filter so constructed that it may be easily, quickly and thoroughly cleaned. Other ob'ects are simplicity, strength and durability of construction. Still other objects and advantages of my inventionl will appear from the following description.

My invention resides in the features of construction and arrangements of parts hereinafter described and pointed out in the ap ended claims. ,y

igure 1 is a central longitudinal section of a filter embodying my invention;

Fig. 2 is an enlarged sectional detail of the structure at the inlet end;

Fig. 3 is an enlarged horizontal section of the interior filtering construction, taken on line 3-3 of Fig. 1; and

Fig. 4 is a diagram of a system embodying my invention.

The casing is shown as cylindrical and composed of a glass cylinder 1 having its ends closed by a top late 2 and a bottom y late 3 secured togetiier by rods 4. The inlet pipe 5 in the construction shown enters through the top plate.

The bottom plate 3 is provided with `a drainage o ening 6 and an outlet opening 7. An out et pipe 8 is secured in the outlet o ening and extends upwardly a substantial distance into the casing. Secured to the upper end of this outlet pipe is a filter member consisting in the form shown of two iiltetbags contained one within the other and having their mouths secured in a liquid tight manner to the 'pipe 8. As shown, each bag is supported by a cylindrical wire frame, the frame 9 of the outer bag being attached at its lower end to a nut 10 which is screwed on to the 4top of the outlet pipe 8; and the frame 11 of the inner bag being .-fsimlarly attached toa nut 12, an externally screw threadedcoupling member 13 coupling the two bags and forming a continuation of the outlet pipe 8. The top ends of the two frames are shown as closed by metal plates, and the external and internal filter bags 14 and 15 of suitable fabric are fitted over the frames 9 and 11, respectively. The bags are so proportioned in length as to reach well up to the inner end of the inlet pipe. If deslred, a filtering medium 15, such as charcoal, may be used in the' space between the nvering these u standing filter bags is a cylindrical imper orate screen member 16 composed preferably of a suitable light metal. This screen 16 is of somewhat larger diameter than the outer filter bag, thus providing an air space between them, and its upper end is closed and its lower end is open. It is Supported by legs 17 with its lower end some distance above the bottom 3 of the casing, but a substantial distance below the upper end of the outlet pipe, the legs 17 being continuations of external longitudinal ribs 17l on the screen member.

This imperforate screen member 16 may be surrounded by a cylindrical foraminous screen 1S of wire mesh which fits over the member 16, being spaced therefrom by the ribs 17. This outer screen 18 rests upon the top of the imperforate screen member 16, and preferably extends. down to the bottom of the casing, being of proper diameter to substantially bisect the drain opening 6, whereby a drainage opening is provided for both the space outside and the space inside of the screen 18.

The outlet pipe 8 is shown as leading to a conduit 19, and a. drain pipe 20 which includes a valve lor cock 21 communicates with the drain opening 6. The inlet pipe 5 is connected to the supply pipe 22 for the through e inlet i e 5 and through theto of the screen 16(5 inner end befingthreiui ed and nuts serving to clamp the screen members 16 and 17 tothe branch pipe-2S.

ipe 23 extends' concentrically` The internal filter structure is thereby securely braced. The inlet pipe 5 has an elbow, as shown, and the branch pipe 23 is secured to the inlet pipe where it enters at the elbow. For convenience in assembling the inletpipe 5 is made to brancho" from the branch pipe 23, thus forming a unitary structure, which is detachably connected t0 the supply pipe `22 by a coupling nut 2li, Cocks and branch pipes, respectively.

During the filtering operation, the cock 26 is closed and the cock 25 is open. The liquid to be filtered enters through the inlet pipe 5 and runs down over the outside of the im perforate screen member 16, the external screen member 18 serving to screen out the. coarsen and lighter particles. When the liquid rises to the top of the outlet pipe 8, it" filters through the filter bag structure and discharges into the outlet pipe and thus into the conduit 19. Since the liquid must take its course around the bottom of the screen member 16 before it can reach the discharge opening in the outlet pipe, a substantial proportion ot the heavier solid particles in the liquid is screened out or separated at this point', and those solid' particles settle to the bottom of the casing. As the pores in the filter img become filled by the solid matter which is filtered out, the, liquid will rise in the filter to a higher level, and will thus at a-ll times Seek a clean filtering surface.

This construction of filter may be easily and quickly cleaned. To effect this, it is only necessary to reierse the. fiow of liquid through the filter in the usualL Way. As the liquid flows outwardly through the filter bags, it: washes off the outer filtering surface, and the solid matter thus removed falls t0 the bottom of the filter. The valve or cock 21 is open and the liquid runs out through thc drain pipe 20. Meanwhile the filter may be thoroughly flushed by liquid entering through the inlet pipe 5 and the branch pipe 23. This cleaning operation may be frcquently repeated Without any material loss in the time of operation of' the filter. If dcsired, the outlet pipe 7 may communicate With a source of fiuid under pressure which is employed for cleaning the filter, and my invention comprehends such a system. `As illustrated in Fig. 4, for example, gas under pressure may be stored in a tank 2T commu-` nicating with the conduit 19, controlling valves 28 and 29 being provided in thc rouduit 19 on opposite sides of thc outlet pipo 8.

' When it is desired to clean the filter, it is only necessary to close the valve 29 and open the valves 21 and 28. The gas under pressure then enters the filtering bags and serves to effectively remove the cake on the outer side thereof'. It will be observed that since the screen member 16 is closed at the top, it serves to trap the air therein, the pressure 25 and 2G are provided in the inlet.

invention, the valves 28 and 29 will both be 75 i open in the normal operation and the filtel-ed liquid will enter the stream of ozone under pressure in the conduit 19; While to clean the filter, it isonly necessary to close` the valve 29 and open the valve 21, thus causing the ozonized atmosphere under pressure to taire its course upwardly through the outlet pipe 8 into the filter. l g

In accordance `with. my invention, means may also be 1provided for thoroughly Withdrawing all t e liquid content from the filter cake o n the outsideof the bag before removing the cake, this being useful in `many industries, `such as sugar refining and the cyanid process of mining, for example. For this purpose an exhaust ump 30 is employed in a branch 3l o the conduit 19,

'which branches ofi' between the valve 29 and the connection with the outlet pipe 8. Valves 32 and 33 control this branch conduit. In carrying out this process of cleaning the filter, therefore,'frst the cocks 25, 26, 28 and 29 will all be closed and the cocks 32 and 33 opened and the fan or pump 30 operated and air drawn through the con- 100 duit 20 and through the filter cake until the filter cake is thoroughly dry, and then the cocks 32 and 33 are closed and the cocks 21 and 28 are opened and thc cleaning Huid admitted to the interior of the filter to rer move the cake.

It is obvious that various modifications may be made in the construction shown in the drawings alud above particularly described within the principle and scope of my 1 l0 i u ventio n VI claim:

1. A filter comprising a casing having an upstanding outlet pipe in the bottom thereof, a filter member secured to the upper end 11.'` thereof', an impcrforate screen member surrounding the filter member and having its lower ond disposed below thr` top of the outlet pipo, and a foraminous screening n1cmher surrounding the screen member with an intervening space and extending below the screen member.

2. A, filter comprising a casing having an opstand] ng outlet pipo in the bottom thereof, a filter member secured to the upper end thereof. an imperioratc screen member surrounding,r the filter member provided With lonfxifluliua] ribs and having its lower end disposed hclow the top of the outlet pipe, and. :x toraminous screening member surrounding th'e screen member and spaced therefrom by the ribs and extending below the screen member.

3. A filter com rising a, easing having an outlet pipe in t e bottom extending upwerdly into the casing, an upstending filter bag construction having its mouth secured to the outlet pipe, an im erforate screen membei' surrounding the ltfer bag construction with an intervening space and having its upper end closed and its lower end open and isposed below the top of the outlet pipe, e foraminous screenin member surrounding the screen member with 4en intervening space and closed over the top thereof, and an inlet pipe in the top of the casing having its inner end engaging the top of the outer foruminous screening member and bracing the same.

fl. A filter comprising a casing having an inlet opening and an outlet opening, un upstnnding outlet pipe in the outlet opening including a removable extension, a coupling .en upstandmg double lilter beg tom-struetion consisting of an internal bag hjaving its mouth secured to the top of the extension and en external beg having its' mouth eur-ed to the coupli `nut.

5. A ltercomprising a casing having an inlet and un outlet opening thereimgen upstanding outlet pipe in the outlet opening La, hollow tubular filter member tteched to t e upper end of the outlet pipe and extending upwardly therefrom into the casing, anv perforete screen member surrounding the filter member with its lower end ,below the top of the outlet pipe, and e cleansing-fluid conductor leading to the top of the Screen member.

In witness whereof, I Subscribe my Sigue ture, in the presence of two witnesses.

ALFRED J. MOISANT.

VVitnesses 1 WAnoo M. CHAPIN, MARY G. HART. 

